Cationically polymerizable resin composition and cured object obtained therefrom

Abstract

Disclosed is a cationically polymerizable resin composition which includes an oxetane-ring-containing vinyl ether compound (A) and/or an alicyclic-epoxy-containing vinyl ether compound (B); and an oligomer or polymer (C) having a molecular weight of 500 or more, being liquid at 0° C., and containing at least one of structures represented by following Formulae (1a) to (1f), wherein R x represents hydrogen atom or methyl group; R 1 to R 3 each independently represent a hydrocarbon group having 1 to 5 carbon atoms; “a” is an integer of from 0 to 5; and “b” is 1 or 2. This cationically polymerizable resin composition has a low viscosity, is easy to work, cures extremely rapidly upon irradiation with light, and can give a cured object excellent in flexibility, thermal stability, and bendability after heat treatment.

The invention claimed is: 
     
       1. A cationically polymerizable resin composition comprising a vinyl ether compound (A) containing an oxetane ring and/or a vinyl ether compound (B) containing an alicyclic epoxy group; and an oligomer or polymer (C) having a molecular weight of 500 or more, being liquid at 0° C., and containing at least one structure selected from structures represented by following Formulae (1a), (1b), (1c), (1d), (1e), and (1f): 
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         wherein R x  represents a hydrogen atom or a methyl group; R 1 , R 2 , and R 3  each independently represent a hydrocarbon group having 1 to 5 carbon atoms; “a” is an integer of from 0 to 5; and “b” is 1 or 2. 
       
     
     
       2. The cationically polymerizable resin composition according to  claim 1 , wherein the oligomer or polymer (C) further contains, in addition to the at least one structure selected from the structures represented by Formulae (1a) to (1f), a structure represented by following Formula (2): 
       
         
           
           
               
               
           
         
         wherein R x  represents a hydrogen atom or a methyl group; and R 4  represents a substituted or unsubstituted hydrocarbon group having 4 or more carbon atoms. 
       
     
     
       3. The cationically polymerizable resin composition according to  claim 1 , further comprising a compound (D) having only one functional group selected from epoxy group and oxetanyl group but having neither vinyl ether group nor vinyl polymer chain in the molecule. 
     
     
       4. A cured object obtained by cationic polymerization of the cationically polymerizable resin composition of  claim 1 . 
     
     
       5. The cured object according to  claim 4 , which is in the form of a film. 
     
     
       6. The cured object according to  claim 4 , which is in the form of a fiber.